Anthracene dye and a process of making



Patented Aug. 17, 1926.

UNITED STATES PATENT OFFICE.

IVAN GUBELHANN, OF SOUTH MILWAUKEE, WISCONSIN, ASSIGNOR TO THE NEWPORT COMPANY 0F MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

ANTHRACENE DYE AND A PROCESS OF MAKING.

llo Drawing.

This invention relates to coloring matter of the anthracene series and a process of making the same, more particularly to the coloring matters obtained by the condensation of a halogenated pyranthrone body with a nitrogen containing aromatic compound having a reacting hydrogen atom connected tothe nitrogen atom. Such an aromatic compound might be a primary or coloring matter of the general type NH:%;

in which R, is the pyranthrone complex and R the anthraquinone radical, and in the formation of a halogen acid. The reaction proceeds best in the presence of a high boil- Application filed April 4, 1925. Serial No. 20,627.

mg solvent, at temperatures ranging between 150-210 C. Neutralizing agents 85 such asanhydrous sodium acetate, and catalyzers such as basic copper acetate, may be. used to facilitate the reaction.

The following examples will serve to illustrate my invention in a preferred form 0 as applied to alpha amino-anthraquinone, its homologs and derivatives, but I do not wish to limit the process to these examples:

[Ca/ample J.Suspend "50 parts'by weight of finely ground dibrom-pyranthrone in 600 46 parts by weight of dry nitrobenzol, add 25 parts by weight of l-ainino-Q-methylanthraquinone, 25 parts by weight of anhydrous sodium acetate in the form of a fine powder, and 10 parts by weight of basic copper ace- 50 tate as a catalyzer. Heat the mixture unc er agitation to 200 C. for a period of 10 hours. The color of the 'mixture changes gradually from red to dark brown. Cool the reaction mass to 60 C. and add 400 55 parts by weight of denatured alcohol. Stir the mixture for 1 hour and filter off the brown reaction product. 'Wash the filter cake with denatured alcohol and hot Water until the solvent and the inorganic salts W have been eliminated After drying and grinding, the reaction product constitutesa reddish brown powder which, from a hydrosulfite vat, dyes cotton a violet shade which oxidizes to a rich brown shade on ex- 635 posure to air or other suitable oxidizing agents. The reaction between dibrom-py ranthone and 1-amino-Q-methylanthraquinone is probably best represented by the following graphical equation:

The exact position of the bromine atom remainin in the pyranthrone radicle and the position of the coupling bond are not known with oertainty. Although this is probably the main reaction, it is obvious that the character of the dye may be influenced by unascertained side reactions.

Example 2.Suspend 50 parts by weight of finely ground dibrom-pyranthrone in 600 parts by weight of dry o-nitrotoluoL add parts by weight of l-amino-anthraquinone, 25 parts by Weight of anhydrous sodium acetate, in the form of a fine powder. and 5 parts by weight of basic copper acct-ate as a catalyzer. Heat the mixture under agitationto 190 C. for a period of 20 hours. The color of the mixture changes gradually Ea n/771 026 3.-Suspend 50 parts by weight of finely ground dibrom-pyranthron in 600 parts by weight of dry onitrotoluol and add from red to dark brown. Pour the reaction mass into 500 parts of water containing 25 parts, by weight of sodium carbonate. Remove the o-nitrotoluol completely by steam distillation and filter off the remaining brown product. VVash-the filter cake thoroughly with hot water to remove inorganic salts. After drying and grinding, the reaction product forms a brown powder Which dyes cotton from a hydrosulfite vat a violet shade which oxidizes to a rich brown shade on oxidation with well-known oxidizing agents used in the dyeing of vat dyes. The reaction product of dibrom-pyranthrone and 1-amino-anthraquinone is probably best represented by the following symbol:

parts by weight of 1-21lTliIiO-6-Cl1l0l.l1b

thraquinone, 25 parts by weight oi anhydrous sodium acetate in the form of a tine The coloring matters thus obtained are in general brown powders, which, from a purple hydrosulfite vat, dye purple shades on cotton and oxidize to rich brown shades on exposure to air or other oxidizing agents.

, The shades obtained are extremely fast to washing, light, and other influences. The powders are insoluble in hot and cold water, sparingly soluble in dilute acids and organic solvents, but usually more so in high boiling organic solvents. In concentrated shlfuric acid they dissolve with a blue to purple color, depending on the constituents used, and are again precipitated on dilution with water. They are, however, easily soluble in alkaline hydrosulfite solution.

I am aware that numerous details of the process may be varied through a wide range without departing from the spirit of this in-' vention, and I do not desire limiting the patent granted other than as necessitated by the prior art.

Iclaim as my inventlonz 1. The processof producing coloring mat-- ters of the anthracene series by heating ,a halogenated pyranthrone body with an anthraquinone body containing a nitrogen atom having a reacting hydrogen atom attached thereto in the presence of a high boilingsolvent and a neutralizing agent.

2. The process of producing coloring matters of the anthracene series by heating a halogenated pyranthrone body with an anthraquinone body containing a nitrogen atom having a reacting hydrogen atom attached thereto in the presence of a high boiling solvent and a neutralizing agent and a catalyzer.

then with water until the cake is free of inorganic salts. After drying and grinding, the reaction product forms a dark brown powder which dyes cotton from a hydrosulfite vat a violet shade which oxidizes to a rich brown shade on exposure to air or other suitable oxidizing agents. The reaction product ofdibrom-pyranthrone and l-amino-6-chloranthraquinone is probably best represented by the following symbol:

3. The process of producing coloring matters of the anthracene series by heating dibrom-pyranthrone with an alpha amino-anthraquinone body in the presence of a high boiling solvent and a neutralizing agent.

4. The process of producing coloring matters of the anthracene series by heating dibrom-pyranthrone with l-amino-Q-methyl .anthraquinone in the presence of a high boiling solvent, anhydrous-sodium acetate as a neutralizing agent anda catalyst.

5. As new articles of manufacture, the coloring matters of the anthracene series which are obtained by heating a halogenated p-yranthrone body with an anthraquinone derivative containing a nitrogen atom having a reacting hydrogen atom.

6. As new articles of manufacture, the coloring .matters of the anthracene series, which are obtained by heating a brom-pyranthrone body with an alpha amino-anthraquinone body.

, 7. The process of producing a coloring matter of the anthracene series, which includes the condensation of a halogenated pyranthrone body with a nitrogen containing aromatic compound having a reacting hydrogen atom attached to the nitrogen atom, with the formation of a halogen acid.

8. The process of producing coloring matters of the anthracene series, which includes the condensation of a brom-pyranthrone body with a l-amino-anthraquinon'e body.

9. The process of producing a coloring matter of the anthracene series, which includes the condensation of a halogenated pyranthrone body with a nitrogen containing aromatic compound having a reacting hy- (lrogen atom attached to the nitrogen atom 1n the presence of a h1gh boiling solvent with the formation of a halogen acid.

Halogen said dyestuffs being in general brown powders, which from a purple hydrosulfite vat, dye purple shades on cotton and oxidize to rich brown shades on exposure to air or other oxidizinr e enlsl wherein the Uetoms in 2, 3 l 5, 6, I positions may be substituted by e, uni e1 g'roup said dyestuffs being in general brown poiwlers which. from a purple hydrosulfite reeeeee 10. As new articles of manufacture, dyestuffs of the anthracene series having mosh probably the following general formula:

l3, Meterials dyed Wlell u d es' suif described in claim 12,

In testimony whereoi l have hereunto subscribed my name.

vet dye purple shadeson cotton and oxidize to rich brown shades on exposure "to the or other oxidizing agents.

EVAN N. 

